[Zope] data.fs

Hi, I'm experiencing a strange problem here. I followed the how-to of 4am : Make your life easier with INSTANCE_HOME. Now, when I start zope in debug mode, everything works fine. However! When I start zope in normal mode, I get an error : InstallError : No access file found at cd $ reldir; pwd - see INSTALL.txt Why do I get this error in normal mode? What check does normal mode more than debug mode? I checked the permissions on the access file and they seem ok to me : -rw-rw---- nobody root Anybody an idea what's wrong with this? Thanks, Tom.